Iron-containing silicates

White, A. F., and A. Yee (1985), "Aqueous Oxidation-Reduction Kinetics Associated with Coupled Electroncation Transfer from Iron-containing Silicates at 25° C", Geochim. Cosmochim. Acta 49, 1263-1275. 

White A. F. and Yee A. (1985) Aqueous oxidation-reduction kinetics associated with coupled electron-cation transfer from iron-containing silicates at 25°C. Geochim. Cosmochim. Acta 49, 1263—1275. 

HCO3 and CO3 to form CO2 in hydrothermal solutions, resulting in a much lower pH than in normal seawater. H4Si04 is released to solution hy high-temperatme silicate reactions, and SO4 is reduced to hy oxidation of Fe + to Fe within iron-containing silicates. 

Whipple ER (1968) Quantitative Mossbauer Spectra and Chemistry of Iron Earth and Atmospheric Science. PhD dissertation, Massachusetts Irrstitute of Technology, Cambridge, 187 p White AF, Yee A (1985) Aqueous oxidation-reduction kinetics associated with coupled electron-cation transfer from iron-containing silicates at 25°C. Geochim Cosmochim Acta 49 1263-1275 Winchell AN (1925) Studies in the mica group. Am J Sci 5lh series 9 309-327... 

NMR has also been used to investigate iron containing silicates and borosilicates/ " the internal structure of Beta/MCM-41 and ZSM-5/MCM-41 composites/ diffusion in silicon imidonitriles, several carbonaceous materials,transition-metal-complex nanochannels, and microporous silica materials. " ... 

Many phosphate ores have high iron contents that render them undesirable for chemical processing into fertilizers. Iron minerals are often present as iron oxides coating the surface or interlocking with the phosphate grains. Complex iron-containing silicates (such as am-phiboles, micas, and clays) are another major source of iron in most phosphate ores. Iron may also be present as iron phosphates. 

It is concluded that iron-containing silicate glass such as 10Na2O -1 OCaO - 5Fe203 - 755102 be a useful... 

Sarpoolaky H, Zhang S, Lee WE. Corrosion of high-alumina and near-stoichiometric spinels in iron-containing silicate slags. J Euro Ceram Soc 2003 23(2) 293-300. 

The iron formed in a blast furnace, called pig iron, contains impurities that make the metal brittle. These include phosphorus and silicon from silicate and phosphate minerals that contaminated the original ore, as well as carbon and sulfur from the coke. This iron is refined in a converter furnace. Here, a stream of O2 gas blows through molten impure iron. Oxygen reacts with the nonmetal impurities, converting them to oxides. As in the blast furnace, CaO is added to convert Si02 into liquid calcium silicate, in which the other oxides dissolve. The molten iron is analyzed at intervals until its impurities have been reduced to satisfactory levels. Then the liquid metal, now in the form called steel, is poured from the converter and allowed to solidify. 

Fig. 2.3 According to the homogeneous accretion model (a), iron-containing material (black) and silicate-containing material (colorless) condensed out at the same time, i.e., the proto-Earth consisted of a mixture of the two. The concentration of iron in the Earth s core took place later. According to the heterogeneous model (b), the iron condensed out of the primeval solar nebula first, while the silicates later formed a crust around the heavy core. From Jeanloz (1983)...

Thermite grenade consisted of a cylindrical sheet iron container filled with thermite (about 600g) slightly moistened with sodium silicate. In the center of the thermite was a cavity in which... 

The LAB-IIICD irons are non-magmatic irons that often contain silicate inclusions. Tungsten is significantly more radiogenic in these meteorites than in the IIAB irons because... 

Other types of asbestos often contain silicates of magnesium, iron and aluminum as well as of magnesium. Commercial forms of asbestos can be white, grayish, bluish or greenish in color. Asbestos is acid- and heat-resistant and may be spun or woven (Refs 2-4)... 

The Badische AniKn- und Soda-Fabrik prepared a nitride of undetermined composition by heating a mixture of silica and carbon in an atm. of nitrogen. The reaction proceeds at a relatively low temp, if a hydroxide or salt of a metal be added. The product contains silicon nitride mixed with the nitride of the metal. The Badische Anilin- und Soda-Fabrik also removed many of the impurities—iron, carbon, silicates, carbides, silicides, and phosphides—by treatment with acids or mild oxidizing agents which do not affect the silicon nitride. A. S. Larsen and O. J. Storm prepared the nitride by the action of nitrogen on molten silicides—e.g. ferrosilicon. 

The siliceous ceramics are produced from naturally occurring minerals that have been purified to only a limited extent, for instance by washing out soluble impurities or removing iron-containing contaminants magnetically. The purer oxides used in capacitors require more elaborate processing. The discussion starts with insulating components based on natural minerals. 

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